My father______(过去经常出差), but now he has already retired.

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问题 My father______(过去经常出差), but now he has already retired.

选项

答案used to travel a lot oil business

解析本题考查used to do，be used to do 和be used to sth．/doing sth的区别。Used to do指过去经常发生的动作；be used to do意思是“被用来做……”；be used to sth．/doing sth．意为“习惯于”。

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大学英语四级

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